controlled via control bits. The timer can be configured to always decrement, or
decrement on selected trigger inputs or previous channel timeout (when channels are
chained). By chaining timer channels, applications can achieve larger timeout durations.
In capture mode, the timer can be used to perform measurements as the timer value is
captured (in the timer value register) when a selected trigger input is asserted. In capture
mode, the timer can support once-off or multiple measurements (for example, frequency
measurements).
The timer channels operate on an asynchronous clock, which is independent from the
register read/write access clock. Clock synchronization between the clock domains
ensures normal operations.
42.2.2 Block Diagram
LPIT
IPS Bus
Interface
Global
Registers
Channel
Registers
Interrupt
Bus Clock
IPS Bus
Global
Synchronizers
Timer
Freeze
Trig Out 0
Pre-Trig Out 0
Low Power
Clock Gate
Timer Channel 0
Timer Channel 1
Timer Channel 2
Timer Channel n-1
Trig Out 1
Pre-Trig Out 1
Trig Out 2
Pre-Trig Out 2
Trig Out n-1
Pre-Trig Out n-1
Pre-Trig Out n
Trig Out n
Previous
Channel
Timeout
Channel
Registers
Async
IRQ bit
32-bit Counter
Trigger Out
Generation
Trigger Rising
Edge
Trigger
Select
Logic that is in every Timer Channel
Counter
Control
Peripheral Clock
D Q
Q
Access
Interface
Async Reset
External Trigger Inputs
(per channel)
Sync'ed Reset to all Timer channels
Channel Registers
Access Synchronizer
Counter Value
Timeout
Load Enable
Sync'ed
External
Triggers
(per channel)
Timer Channel n
Figure 42-1. Top Level Block Diagram
Introduction
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1124
NXP Semiconductors
Содержание KE1xF Series
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